Single-Loop Robust Predictive Speed Control of PMSM System with Overcurrent Protection: A Disturbance Preview Approach
Jinhao Liu, Jun Yang, Shihua Li
Abstract
This paper addresses the single-loop robust speed regulation problem of permanent magnet synchronous motor (PMSM) with overcurrent protection by using a disturbance preview approach. A reduced-order generalized proportional integral observer (GPIO) is first developed to estimate, and predict the future behavior of the disturbance in PMSM system. By integrating the disturbance estimation and prediction into the output prediction, a disturbance preview enhanced robust predictive control law is obtained by solving a resulting receding horizon constrained optimization problem. The overcurrent protection problem in PMSM is addressed by taking it as a control variable constraint in the receding horizon optimization problem. Experimental studies are extensively conducted to demonstrate the feasibility and benefits of the proposed control approach, where the results show that the proposed method achieves effective functionality of overcurrent protection, and much better dynamic disturbance rejection performance as compared with extant offset-free MPC methods.